[Milsurplus] RBZ vs RBZ Special?

[Mike T]

I've been trying to research what the circuit differences are between the RBZ and RBZ Special. The difference on paper is that the RBZ covers from 2.0mc to 5.8mc whereas the Special covers from 5mc to 13mc. From the limited information I've been able to find it seems like the conversion was a field conversion that involved little more than realigning the receiver and changing the dial face for a new one. I spent some time today attempting to do just that on my RBZ and found that the RF and OSC trimmers would only give about +/- 300khz of adjustment. I'm not sure where they found an extra 7mc or so. Does anyone have any information or ideas?

- Mike